Bruce Schneier is a renowned American cryptographer, computer security expert, and author. He is best known for his work in the field of cybersecurity and has written several influential books, including Secrets and Lies and Liars and Outliers. Schneier is also a frequent speaker and commentator on issues related to privacy, security, and technology. In addition to his writing, Schneier founded Schneier on Security, a popular blog where he shares insights and analysis on current security topics. He has served as a security expert for various organizations and has contributed to the development of security protocols, making him a prominent figure in the tech community.